| Portlethen to Olympia Heights (Florida) | 4,306.64 mi (6,930.87 km) |
| Portlethen to Omaha (Nebraska) | 4,027.85 mi (6,482.21 km) |
| Portlethen to On Top of the World Designated Place (Florida) | 4,193.66 mi (6,749.04 km) |
| Portlethen to Onalaska (Wisconsin) | 3,729.38 mi (6,001.87 km) |
| Portlethen to Oneida (New York) | 3,226.87 mi (5,193.14 km) |
| Portlethen to Oneonta (New York) | 3,235.33 mi (5,206.76 km) |
| Portlethen to Ontario (California) | 5,111.54 mi (8,226.23 km) |
| Portlethen to Ontario (Oregon) | 4,506.91 mi (7,253.17 km) |
| Portlethen to Opa-locka (Florida) | 4,293.81 mi (6,910.22 km) |
| Portlethen to Opelika (Alabama) | 4,114.68 mi (6,621.94 km) |
| Portlethen to Opelousas (Louisiana) | 4,473.37 mi (7,199.19 km) |
| Portlethen to Orange (California) | 5,131.83 mi (8,258.89 km) |
| Portlethen to Orange (Texas) | 4,555.57 mi (7,331.48 km) |
| Portlethen to Orange City (Florida) | 4,165.90 mi (6,704.37 km) |
| Portlethen to Orangeburg (South Carolina) | 3,904.94 mi (6,284.39 km) |
